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131 .IX Title "DSA_SET_METHOD 3"
132 .TH DSA_SET_METHOD 3 "2018-09-11" "1.1.1" "OpenSSL"
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138 DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL \- select DSA method
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/dsa.h>
144 \& void DSA_set_default_method(const DSA_METHOD *meth);
146 \& const DSA_METHOD *DSA_get_default_method(void);
148 \& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
150 \& DSA *DSA_new_method(ENGINE *engine);
152 \& DSA_METHOD *DSA_OpenSSL(void);
155 .IX Header "DESCRIPTION"
156 A \fB\s-1DSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1DSA\s0
157 operations. By modifying the method, alternative implementations
158 such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for
159 important information about how these \s-1DSA API\s0 functions are affected by the use
160 of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls.
162 Initially, the default \s-1DSA_METHOD\s0 is the OpenSSL internal implementation,
163 as returned by \fIDSA_OpenSSL()\fR.
165 \&\fIDSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DSA\s0
166 structures created later.
167 \&\fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has
168 been set as a default for \s-1DSA,\s0 so this function is no longer recommended.
169 This function is not thread-safe and should not be called at the same time
170 as other OpenSSL functions.
172 \&\fIDSA_get_default_method()\fR returns a pointer to the current default
173 \&\s-1DSA_METHOD.\s0 However, the meaningfulness of this result is dependent on
174 whether the \s-1ENGINE API\s0 is being used, so this function is no longer
177 \&\fIDSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key
178 \&\fBrsa\fR. This will replace the \s-1DSA_METHOD\s0 used by the \s-1DSA\s0 key and if the
179 previous method was supplied by an \s-1ENGINE,\s0 the handle to that \s-1ENGINE\s0 will
180 be released during the change. It is possible to have \s-1DSA\s0 keys that only
181 work with certain \s-1DSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module
182 that supports embedded hardware-protected keys), and in such cases
183 attempting to change the \s-1DSA_METHOD\s0 for the key can have unexpected
184 results. See DSA_meth_new for information on constructing custom \s-1DSA_METHOD\s0
187 \&\fIDSA_new_method()\fR allocates and initializes a \s-1DSA\s0 structure so that \fBengine\fR
188 will be used for the \s-1DSA\s0 operations. If \fBengine\fR is \s-1NULL,\s0 the default engine
189 for \s-1DSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DSA_METHOD\s0
190 controlled by \fIDSA_set_default_method()\fR is used.
192 .IX Header "RETURN VALUES"
193 \&\fIDSA_OpenSSL()\fR and \fIDSA_get_default_method()\fR return pointers to the respective
194 \&\fB\s-1DSA_METHOD\s0\fRs.
196 \&\fIDSA_set_default_method()\fR returns no value.
198 \&\fIDSA_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as
199 the method for \fBdsa\fR (including unloading the \s-1ENGINE\s0 handle if the previous
200 method was supplied by an \s-1ENGINE\s0).
202 \&\fIDSA_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be
203 obtained by \fIERR_get_error\fR\|(3) if the allocation
204 fails. Otherwise it returns a pointer to the newly allocated structure.
206 .IX Header "SEE ALSO"
207 \&\fIDSA_new\fR\|(3), \fIDSA_new\fR\|(3), \fIDSA_meth_new\fR\|(3)
209 .IX Header "COPYRIGHT"
210 Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
212 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
213 this file except in compliance with the License. You can obtain a copy
214 in the file \s-1LICENSE\s0 in the source distribution or at
215 <https://www.openssl.org/source/license.html>.